Fans tuning in to this years Fashion Rocks concert special on CBS tomorrow (September 9) and hoping to catch Lil Waynes performance may be disappointed as the rapper missed the date due to a scheduling conflict.

Wayne was scheduled to close out the New York Fashion Week kick-off event, which was taped at Radio City Music Hall on Friday (September 5) for a two-hour special broadcast on CBS tomorrow.

However, his appearance was cancelled at the last minute due to a change in the shows line-up, AllHipHop.com has learned.

They were looking for Wayne to appear earlier than he was set to perform, Young Money Entertainment rep Cortez Bryant told AllHipHop.com. He was five blocks away, caught in traffic in the Lincoln Tunnel. They said they wouldnt hold the audience and they were cutting his show.

Now in its fifth year, the star-studded Fashion Rocks event has become a Fashion Week staple, spotlighting the relationship between the worlds of music and fashion.

Presented by publishing giant Conde Nast, the combination concert/fashion show is also used as an opportunity to raise awareness of worthy causes.

This year, the charity of choice was Stand Up To Cancer, recently launched by the Entertainment Industry Foundation to raise money for cancer research.

Beyonce, Mariah Carey, Mary J. Blige, Rihanna, Fergie, Miley Cyrus and Natasha Bedingfield performed the organizations signature single Just Stand Up, providing a live feed to the Stand Up telethon broadcast on ABC, NBC, and CBS simultaneously on Friday.

Additional performances were given by Timbaland, Justin Timberlake and Beyonce.

ASCAP Songwriter of the Year Timbaland presented several of his most recent hits with assistance from Chris Cornell, The Pussycat Dolls and One Republic, before appearing to close out his set, just as a designer would close out a runway show.

Timberlake and Beyonce each paid homage to the past with covers of Marvin Gayes Got To Give It Up and Etta James At Last.

Also on hand were the Black Eyed Peas, Chris Brown, Kid Rock, Solange, and British Pop/Soul singer Duffy.

The Fashion Rocks special airs Tuesday, September 9 at 9 pm EST on CBS.